The C31XR-JK has a central open area of 50", which was just enough to allow
for a ring rotator. It was tight. 50" is not quite enough to accommodate
a swinging gate on AB-105 tower, as I have here.
Dave, N3RD
On Mon, Mar 25, 2024 at 10:47 PM Ron WV4P <wv4ptn@gmail.com> wrote:
> The C31XR-JK has 40" spacing just for side mounting.
>
> Ron, WV4P
>
> On Mon, Mar 25, 2024 at 9:15 PM <john@kk9a.com> wrote:
>
> > If you are going to phase the antennas you should use the same Yagi as
> your
> > upper one plus the same feedline length. It can be difficult to find
> > enough
> > open space to side-mount modern interlaced tribanders and you may have to
> > buy two antennas with sufficient space and also replace the top one. I
> am
> > not sure why you picked 35', if the Trylon tower is self-supporting it
> > should be narrower slightly higher up giving you more turning room and
> > possibly a better pattern. There are not a lot, if any, commercial swing
> > gates for towers manufactured these days but you can fabricate your own
> or
> > use a ring rotator to have full rotation.
> >
> > GL
> > John KK9A
> >
> >
> > Alex Filippov wk1o wrote:
> >
> > I am looking for antenna and installation advice.
> >
> > I am looking to install a tri-bander 10-15-20 on the side of the
> > self-supporting 80 ft Trylon tower at around 35 ft above ground level to
> > stack with the tri-bander at the top of the tower. I really would like
> this
> > antenna to rotate maximally around the tower. Obviously, there is a limit
> > to how much it can be turned. The distance between the center ( driven?)
> > element of the tri-bander and the next element should be maximally
> possible
> > to accommodate the max rotating angle. Also is the length of the arm on
> > which the antenna will be installed.
> >
> > I am looking for practical advice on the best suitable commercially
> > available tri-banders for such application and any advice on the
> > installation. It looks like it will need two horizontal arms, rotator
> > plate(s)
> >
> > I'm sure this has been done many times before, so if you know where to
> look
> > for advice to avoid the errors of the first time tinkerer, that would be
> > greatly appreciated.
> >
> > Thank you,
> >
> > Alex, WK1O
> >
> >
> > _______________________________________________
> >
> >
> >
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> >
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